ALT Item for Pinch-type checkvalve

[Hoagie]

I'm in the process of specifying a checkvalve for a storm drain that will connect to a sanitary sewer..the storm drain is a trench drain inside a industrial-type garage and is fitted with an oil-water seperater...

I'm concerned with backflows of liquids and gas originating from the sanitary sewer. I've found a checkvalve that can do the job; its a pinch-type valve by Tideflex and seems to be a good product, yet a bit pricey.

Any recommendation for any alternates that may be cheaper?

Thanks for reading,

H.

 

[bimr]

Did you write this correctly?

"checkvalve for a storm drain that will connect to a sanitary sewer". I am sure you know that storm sewers do not connect to sanitary sewers.

In regards to the check valve, it is very unlikely that a check valve can be made to work reliably in a sanitary sewer. The amount of head available with a gravity flow sewer system is not likely to reliable close any type of check valve. You also have to worry about solids that will jam the check valve.

If you are concerned about sewer gases, use a water seal to prevent gases from coming through the sewer.

If you are concerned about sewer back-up, look into an "overhead" or pumped sewer. An "overhead" sewer can be designed very easily and it will be more reliable than depending on a sewer backup prevention device.

 

[SteveWag]

I have used some TideFlex and RedFlex and recommend that you be very conservative regarding the pressure required to open the valve; the published pressures are way low.
Steve Wagner

 

[JedClampett]

We had someone here a while back singing the praises of Proflex (

http://www.procoproducts.com/Gen-CheckValves/gen-checkvalves.html).

Of course, they represented the product.

 

[Hoagie]

thanks for the input jed and stevewag. i will weigh those options again the other products i've found.

cheers,

h.

 

[RWF7437]

How are you allowed to connect this drain to a storm drain ? Most jurisdictions in the U.S. would require this to be connected to a sanitary sewer.

Such connections usually require at least a gas trap ( goose neck is the slang term). If the floor elevation is below the manhole rim elevation outside the garage then the plumbing code requires a backwater valve, regardless of the cost.

good luck

 

[jonathand]

or try the WaStop.. yes.. i use them, but i've also used the Tideflex in the past. Much lower head loss.

Jon

 

[stanier]

I would use Tideflex.

The price of an article is soon forgotten when it doesnt work. Tideflex works. I have tried all manner of devices, none compare with the reliability of this device for this application.

Have you considered the risks & cost of failure?

 

[CivEnvEng98]

Our firm evaluated something quite similar for a fire station. These fire trucks are usually kept in a state of cleanliness like it's nobody's business, so there is ALOT of oily wash water. Plus, in some cases the fire dept has Hazardous Waste response vehicles so whatever is washed off can't be recylced or discharged to the stormwater system/environment.

In this case, the wash water HAS to go to the sewer system. They usually end up pre-treating for oil and/or any other goodies the Utility wants them to take out.

We did evaluate using

http://www.redvalve.com

vs a small fiberglass wetwell pump system. In the end, we had to rule out the pinch valve as we didn't feel there was sufficient vertical drop to the nearest manhole, which was partially a function of how much pressure we felt was required to open those pinch valves with sufficient safety factor.